Make activated plugins count in Admin widget correct (#11377)

* Do not count always activated plugins.
Fixes #11144

* UI test: Fixed count of activated plugins

core/Plugin/Manager.php

@@ -554,13 +554,14 @@ class Manager
         throw new \Exception('Theme not found : ' . $themeName);
     }
 
-    public function getNumberOfActivatedPlugins()
+    public function getNumberOfActivatedPluginsExcludingAlwaysActivated()
     {
         $counter = 0;
 
         $pluginNames = $this->getLoadedPluginsName();
         foreach ($pluginNames as $pluginName) {
-            if ($this->isPluginActivated($pluginName)) {
+            if ($this->isPluginActivated($pluginName)
+                && !$this->isPluginAlwaysActivated($pluginName)) {
                 $counter++;
             }
         }

plugins/CoreHome/Widgets/GetSystemSummary.php

@@ -58,7 +58,7 @@ class GetSystemSummary extends Widget
             'numWebsites' => count($websites),
             'numUsers' => $numUsers,
             'numSegments' => $this->getNumSegments(),
-            'numPlugins' => $this->getNumPlugins(),
+            'numPlugins' => $this->getNumActivatedPlugins(),
             'piwikVersion' => Version::VERSION,
             'mySqlVersion' => $this->getMySqlVersion(),
             'phpVersion' => phpversion()
@@ -77,8 +77,8 @@ class GetSystemSummary extends Widget
         return $db->getServerVersion();
     }
 
-    private function getNumPlugins()
+    private function getNumActivatedPlugins()
     {
-        return count($this->pluginManager->getActivatedPlugins());
+        return $this->pluginManager->getNumberOfActivatedPluginsExcludingAlwaysActivated();
     }
 }
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